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Abstract

A closed loop digital-to-analog conversion is accomplished without the use of expensive precision components.

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United States

Language

English (United States)

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Closed Loop Digital To Analog Conversion

A closed loop digital-to-analog conversion is accomplished without the use of
expensive precision components.

The main control 10 provides a three-digit digital-to-analog conversion which
is scaled down to the required voltage by resistors R1 and R2 to establish a
reference for the control amplifier 12. Regulation is achieved by comparing the
feedback voltage from R shunt to the reference voltage developed at the junction
of R1 and R2, in the control amplifier 12. The digital meter 14 is used to read
and display the voltage developed across R shunt. Although regulation is
achieved at the control amplifier 12, all preceding components including the
control amplifier contribute to error and thermal drift. Usually, this error is
eliminated by using precision and temperature-compensated components which
are very expensive.

The loop can be inexpensively closed by comparing the digital output from
the panel meter 14 with the desired digital value by means of a digital comparator 16. The comparator 16 controls the direction of an up/down counter 18, which is
incremented by each step command from the meter 14. The binary count output
of up/down counter 18 is applied to a binary digital-to-analog converter which
converts the binary count to an analog correction voltage which "tunes" the
reference voltage at the junction of R1 and R2. The addition of the digital
comparator 16, the binary up/down counter 18 and the 12-bit binary digi...